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99% Invisible
99% Invisible

Kobuk the Destroyer

September 08, 2026 • 38m

Summary

⏱️ 10 min read

Overview

This episode of 99% Invisible explores the hidden world of test engineering through Alex Davies' book 'Kobuk the Destroyer.' From bears testing outdoor gear to chicken cannons fired at jet engines, the conversation reveals how products are rigorously tested for safety, durability, and failure scenarios. The discussion covers limit testing, foolproofing, disintegration testing, and the evolving challenges of testing AI and autonomous vehicles in real-world environments.

Kobuk the Destroyer: Testing Bear-Resistant Products

The episode introduces Kobuk, a famous grizzly bear who became legendary for testing supposedly bear-resistant products at a bear sanctuary. After being deemed a 'problem bear' for getting into human food in Alaska, Kobuk was relocated to a sanctuary where he excelled at breaking into containers. His success rate was so impressive that manufacturers whose products survived his testing would celebrate the achievement in local newspapers, making Kobuk more of a destroyer of egos and product designs than anything else.

  • Bear canisters were originally tested with weights and spikes, but these methods didn't account for bear creativity and resourcefulness
  • Testing facilities now use actual bears - manufacturers fill canisters with treats like fish and honey and give them to grizzly bears for one hour
  • Kobuk was removed from Alaska wilderness as a 'problem bear' and brought to a sanctuary where he became excellent at testing products
  • If a product survived Kobuk's testing, it might even get written up in local papers
" Kobuk was more a destroyer of ego and of product design than anything. He was just really good at it. "

The Origins of Modern Product Testing

Test engineer W.H. Merrill founded Underwriters Laboratories at the beginning of the 20th century to address public fears about electricity causing fires. At a time when entire cities still burned down regularly and electric appliances were entering homes, Merrill created a business testing products against manufacturers' claims. Within 15 years, UL was testing millions of products annually, and their seal of approval became so trusted that entire cities and retailers like JCPenney required it.

  • W.H. Merrill founded Underwriters Laboratories to test electrical products when electricity was new and terrifying to consumers
  • Before electric irons, an iron was literally a chunk of heated iron - that's why it's called an iron
  • Within 15 years, UL was testing millions of products per year
  • Cities like Los Angeles and retailers like JCPenney required products to have UL approval before they could be sold
  • UL kept incredibly detailed handwritten reports, including precise temperature gradients over time for fire resistance testing
" Before you had an electric iron, an iron was a chunk of iron you got really hot and you pressed it on your clothes. That's why it's called an iron. "

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